SU742900A1 - Switch-type ac voltage stabilizer - Google Patents

Description

The invention relates to electrical engineering and can be used in power circuits of various electronic equipment.

Known key AC voltage stabilizer. Μ. containing a regulating element ^S made on a diode bridge, the diagonal of which includes a transistor, a recuperator, a filter, and a control unit.

It is also known devices is the closest technical solution to the present invention comprising a regulatory element, an integrating filter, which is connected to the input of PE ₁₅ kuperator formed on the two thyristors, and an output connected to 'the output terminal, a control unit, an input coupled to the output terminals, and the output with the control inputs of the control element is the jq element and a synchronization unit, the input of which is connected to the input terminals, and the output with the control electrodes. thyristo, ditch.

The recuperating device in such stabilizers is made in the form of two interconnected-parallel connected thyristors. Its disadvantage is the private failure of the transistor of the key regulatory element when the thyristor is accidentally opened not in its half-cycle. Transistor failure is caused by a short circuit current in the transistor-thyristor circuit. A similar situation can occur when the stabilizer is turned on or off or when there is interference in the network. The mentioned phenomenon significantly reduces the reliability of the stabilizer.

The purpose of the invention is to increase the reliability of the stabilizer by eliminating short circuit currents in the circuit of the regulating element-recuperator.

This is achieved due to the fact that the control element is made on two transistors, shunted by diodes, the bases of which are connected to the corresponding control inputs of the control element, and the cathode of each of the recuperator thyristors is connected to the emitter of the corresponding transistor, a collector connected to one of the input terminals, and the anode is connected to another input terminal.

The drawing schematically shows the proposed stabilizer.

The stabilizer includes a regulating element consisting of trap 1 and. 2, shunted diodes - ₁₀ * MI 3 and 4. To the emitters of the transistors are connected the cathodes of the thyristors 5 and 6 of the recuperator, the anodes of which are connected to the corresponding input terminals (control points 7 and 8), and the control _{) 5} electrodes to the output of the 9 synchronization circuit. The input of the regulatory element is connected to the output of the control unit 10. Between the output of the control element and the load 11 connected to the output terminals, an integrating filter is installed, consisting of a reactor 12 and a capacitor 13.

The proposed device operates as follows. 25

When you open one of the transistors of the regulatory element, for example, transistor 1, the network voltage 'is supplied to the i-Load 11 through the inductor 12 and diode 4.

When closing the transistor 1 ³⁰ Retained accumulated in the inductor 12, the electromagnetic energy is transferred to the load through the thyristor 6 and diode 4. The synchronization circuit 9 in this case takes the potential at the opening-and-closing thyristor 6 - 35 to the thyristor 5, control unit 10 opens the transistors 1 and 2 regulating elements with a frequency 6 0-80 times higher than the mains frequency, and an integrating filter consisting of inductor 1 2 and 40 of the capacitor 13 converts high-frequency voltage pulses taken from the output of the key regulating element to an alternating voltage Network frequency. The magnitude of this voltage is determined duty cycle ⁴⁵ of operation of the adjusting member and can vary over a wide range or kept constant. In the next half-cycle of the mains voltage, at point 7 there will be a voltage 50 of negative polarity, and at point S, the voltage will also be supplied to the load through transistor 2 and diode 3. At this moment, the synchronization circuit opens. thyristor 5 and recovery of accumulator- ⁵⁵ in the choke of the filter of electromagnetic energy occurs through thyristor 5 and diode 3 to load 11.

When non-phase Opening of thyristors 5 or 6 under the influence, for example, of interference in the corresponding circuit, the thyristor current passes a short circuit, which causes a fuse to blow out or an electronic protection to trip.

For example, if at point 7 there is a positive wave of mains voltage, at point 8 it is · negative and a thyro opens. torus 5, then the short circuit current passes through the circuit of the thyristor 5 - diode 4, Power transistors are outside the short circuit and, therefore, are not destroyed (see drawing),

Therefore, the reliability of the proposed device is increased due to the fact that the short-circuit currents passing through the key regulating element · * recuperator circuit do not pass through the transistor of the key regulating element, but through the shunt diode. Since diodes and thyristors have an overload capacity much greater than transistors, in the short-circuit mode the electronic protection manages to trip before the stabilizer power elements burn out.

Claims (1)

The recuperator's thyristors are connected to the emitter of the corresponding transistor, the collector connected to one of the axon glue, and the anode is connected to the other input terminal. The circuit of the circuit shows the previous lag state stabilizer. The stabilizer contains a regulator, a food element consisting of transistors 1 and 2, shunted diodes 3 and 4. The emitters of transistors are equipped with the cathodes of thyristors 5 and 6, RyKyripaTOpa, anohytes, kyo they are connected to the corresponding input terminals (contact points 7 and 8), and the control electrodes to the output of the cross-connection circuit 9. days The input of the regulating element podkgao 4eh to the output of the unit 10 of the send. An intermediate control element and a load 11. A THERMAL DIGITAL TO OUTPUT terminal is fitted with a filter filter consisting of 12 leads and a capacitor 13. The proposed device works as follows. When it is equipped with one of the transistor components, one element , trans ™ S1 | on-one 1. The mains voltage comes to load 11 through choke 12 and for 4 When the transistor 1 is closed, the accumulated ™ energy in choke 12 electromagnetic energy51 is transferred to the load through thyristor 6 and diode 4. Circuit 9 sig-sronyadii in this slrshe submits the opening thyristor 6 potential and thyristor 5 input potential; control unit 10 opens transistors 1 and 2 of the regulating element with a frequency of 60–80 times or t h, frequency of the network, and integration of 1DY (a filter consisting of drossel 12 and the capacitor 13, converts high-frequency voltage pulses taken from the output of the key regulating element into an alternating voltage with the mains frequency. The magnitude of this information is determined by the regulating element of the regulating element and can vary in width or supported shats standing up} shoy. In the next half-period of the mains voltage at point 7 there will be a voltage 01Т) Sh1at8arnogo polarity, and at point 8 - PV & thyristor 5 and recuperatively accumulated in the choke of the electromagnetic electromagnetic filter occurs through thyristor 5 and diode 3 into load 11. With non-phase opening of thyristors 5 or 6 under the influence of, for example, interference on the corresponding day, the thyristor diode passes a short-circuit current that causes the fuse to blow or electronic protection actuation. For example, if at point 7 a positive wave of the mains voltage, at point 8 - is negative and the thyriotor 5 opens, then the short-circuit current passes through the thyristor 5 - diode 4, The sludge transistors are outside the short circuit and are thus not subject to destruction (see drawing). Consequently, the reliability of the proposed device is increased due to the fact that short circuit currents passing through the terminal are a key regulating element - heat exchanger. t not through the transistor of a key regulating element, but through a shunt diode. Since the diodes and thyristors have a much higher overload capacity than transistors, in the short-circuit mode, the electronic protection manages to operate in a different way than the power elements of the stabilizer burn out. Claims An alternating voltage key regulator, containing a regulating element, an integrated filter, whose input has a recuperator connected to two thyristors, and an output connected to output terminals, an alignment unit, an input connecting to output, terminals, and an output connector. the inputs of the regulating element, and the synchronization unit, the input of which is connected to the input terminals, and the output with the control electrodes of the thyristors, is about that and with the fact that, with the increase of reliability by eliminating short-circuit currents in the depi regulating element heat exchanger; connected to one of the input terminals 5742900 and the anode is connected to another input. USSR author's certificate Sources of information taken into account in the examination No. 472339, cl. Q 05 F 1/44, 1973. 2,., USSR Copyright Certificate No. 488197, cl. Q 05 F 1/30, 1973.